<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <script>
      function fn(x, y) {
        return x + y;
      }
      console.log(fn(1, 1)); //2
      console.log(fn(1, 2)); //3
      console.log(1 + 1); //2
    </script>
  </body>
</html>
